YES Problem: b(a(a(b(b(x1))))) -> a(a(b(b(b(a(a(x1))))))) Proof: DP Processor: DPs: b#(a(a(b(b(x1))))) -> b#(a(a(x1))) b#(a(a(b(b(x1))))) -> b#(b(a(a(x1)))) b#(a(a(b(b(x1))))) -> b#(b(b(a(a(x1))))) TRS: b(a(a(b(b(x1))))) -> a(a(b(b(b(a(a(x1))))))) Arctic Interpretation Processor: dimension: 1 interpretation: [b#](x0) = x0, [a](x0) = x0 + -16, [b](x0) = 4x0 + -8 orientation: b#(a(a(b(b(x1))))) = 8x1 + -4 >= x1 + -16 = b#(a(a(x1))) b#(a(a(b(b(x1))))) = 8x1 + -4 >= 4x1 + -8 = b#(b(a(a(x1)))) b#(a(a(b(b(x1))))) = 8x1 + -4 >= 8x1 + -4 = b#(b(b(a(a(x1))))) b(a(a(b(b(x1))))) = 12x1 + 0 >= 12x1 + 0 = a(a(b(b(b(a(a(x1))))))) problem: DPs: b#(a(a(b(b(x1))))) -> b#(b(b(a(a(x1))))) TRS: b(a(a(b(b(x1))))) -> a(a(b(b(b(a(a(x1))))))) Matrix Interpretation Processor: dim=4 interpretation: [b#](x0) = [0 1 0 0]x0, [0 0 0 0] [0 0 0 1] [a](x0) = [0 0 0 0]x0 [1 0 0 0] , [0 0 1 1] [0] [0 1 0 0] [0] [b](x0) = [1 0 0 0]x0 + [0] [0 0 0 0] [1] orientation: b#(a(a(b(b(x1))))) = [1 0 0 0]x1 + [1] >= [1 0 0 0]x1 = b#(b(b(a(a(x1))))) [0 0 0 0] [0] [0] [1 0 0 0] [1] [1] b(a(a(b(b(x1))))) = [0 0 0 0]x1 + [0] >= [0] = a(a(b(b(b(a(a(x1))))))) [0 0 0 0] [1] [0] problem: DPs: TRS: b(a(a(b(b(x1))))) -> a(a(b(b(b(a(a(x1))))))) Qed